I've been deveoping an android app (using ChatGPT - I have no real android development knowledge!) which animates a dog's mouth through the camera feed. I had the app working okay but with some latency between the camera feed and the overlay (using CameraX and a PreviewView), so I tried to update it to an offscreen rendering approach, using an EGL context and MediaCodec surface to render the camera feed plus overlays into a single composited output.
However, the I have not implemented this correclty and the camera feed is just showing a black screen.
Here's ChatGPT's summary of what we had originally (working) and what we changed it to. Both of these approaches are saved on different github branches which you will have access to. You can see the previously working version on the master branch, and the newly updated (not working) version on a test branch.
What We Had Originally - An Android app (Kotlin) using CameraX and a PreviewView to display the live camera feed. - A BoundingBoxOverlay custom View drawn on top for YOLO pose detection (dog’s mouth, eyes, etc.). - We wanted to animate the dog’s mouth in sync with audio but were limited by the traditional overlay.
What We Changed It To Offscreen Rendering Approach: - Created an EGL context and MediaCodec surface (via OffscreenRenderer.kt) to render the camera feed plus overlays into a single composited output. - The camera feed is now provided by a SurfaceTexture created from an external OES texture (rather than using PreviewView). - CameraX is configured to output frames to that SurfaceTexture. - A custom pipeline composites the camera and any overlays (animated mouth, etc.) in OpenGL, then encodes to a video file with MediaCodec.
What We’re Trying to Achieve A Snapchat-like pipeline: - Grab the camera feed directly via a SurfaceTexture (external OES texture). - Apply real-time overlays/filters (like mouth animation, hats, glasses) in OpenGL. - Composite everything offscreen and encode it into a video file (for recording). - Avoid the performance constraints of standard Android Views by relying on OpenGL compositing (similar to Snapchat filters).
Despite these changes, the feed currently displays a black screen. We suspect an issue with the GL pipeline, resolution mismatch, or camera frames not drawing as intended.
Goal: Fix the offscreen renderer so that camera frames plus overlays appear in real time, and video recording also works as expected.
YouTube Productivity Software Explainer Videos Category: Adobe Premiere Pro, After Effects, Camtasia, Explainer Videos, Video Editing, Video Production, Video Services, Videography Budget: ₹600 - ₹1500 INR
05-Feb-2026 23:04 GMT
Management Category: Admin Support, Internet Marketing, Property Management, Social Media Marketing Budget: $250 - $750 USD
05-Feb-2026 23:03 GMT
Modern Phoenix Dachshund Logo Category: Adobe Illustrator, Photoshop, Branding, Graphic Design, Illustration, Logo Design, Vector Design Budget: $30 - $250 AUD
05-Feb-2026 23:02 GMT
Lovable to WordPress Category: HTML, MySQL, PHP, SEO, SSL, Web Development, Website Management, WordPress Budget: €8 - €30 EUR
05-Feb-2026 23:00 GMT
Business Video Editor/Creator Category: Adobe Premiere Pro, After Effects, Animation, Content Creation, Creative Design, Video Editing, Video Production, Video Services Budget: ₹600 - ₹1500 INR
WordPress Security Cleanup & SEO Category: Computer Security, Database Management, Internet Security, SEO, Web Security, Website Management, Website Optimization, WordPress Budget: $250 - $750 NZD
05-Feb-2026 22:50 GMT
Traditional 2-3BR SIPs Home Category: Architecture, AutoCAD, Building Architecture, Building Design, Construction, Project Management, Project Scheduling, Structural Engineering Budget: $1500 - $3000 USD
05-Feb-2026 22:50 GMT
Modern Commercial Pool Design Category: AutoCAD, Building Design, CAD / CAM, Construction Management Budget: $15 - $25 USD
05-Feb-2026 22:46 GMT
Asistente Ventas con Llamadas CRM -- 2 Category: CRM, Customer Service, Data Entry, Data Management, ERP, Lead Generation, Odoo, Sales, Sales Management, Software Architecture Budget: €6 - €12 EUR
05-Feb-2026 22:45 GMT
Quick Logo Text Update _TIME SENSITIVE Category: Adobe Illustrator, Photoshop, Business Card Design, Graphic Design, Logo Design, PDF, Word Budget: $10 - $30 USD